Question

Write the dominant equilibrium in an aqueous solution of each of the following. Be sure to...

Write the dominant equilibrium in an aqueous solution of each of the following. Be sure to include phase labels. If the salt will not affect the pH, just type "NR", to indicate there is no equilibrium reaction.

a. CH3NH3Cl

b. (NH4)2SO4

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Answer #1

a) CH3NH3Cl(aq) ------------> CH3NH3+ (aq) + Cl-(aq)

CH3NH3+(aq) + H2O(l) <-----------> CH3NH2(aq) + H3O+ (aq)

Thus the equilibrium makes the solution acidic as the salt is formed from weak base CH3NH2 and strong acid HCl and the cation CH3NH3+ undergoes acidic hydrolysis.

b) (NH4)2SO4

(NH4)2SO4 (aq) -----------> 2NH4+(aq) + SO4-2(aq)

NH4+  (aq) + H2O(l) <-----------> NH4OH(aq) + H+ (aq)

This salt is also a salt of weak base NH4OH and strong acid H2SO4 thus undergoes cationic hydrolysis and becomes acidic in aqueous solution.

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